Amplifier



FIG. 1 is a front elevational view of a first embodiment of an amplifier showing our new design;

FIG. 2 is a left side elevational view thereof; and

FIG. 3 is a right side elevational view thereof.

FIG. 4 is a front elevational view of a second embodiment of an amplifier showing our new design;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The portions indicated in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an amplifier, as shown and described. 